Docker

Table of contents

1. 1. Docker Fundamentals

   3 tasks · 2 interviews· 15 min
   • Explain the difference between containers and Virtual Machines.
   • Describe how containers share the host kernel.
   • Run a simple container in the foreground and understand basic container isolation.

   docker-fundamentals

2. 2. Container Lifecycle

   3 tasks · 2 interviews· 30 min
   • Start, stop, and restart containers.
   • Run containers in detached mode.
   • View container logs and inspect container state.
   • Clean up stopped containers and unused images.

   container-lifecycle

3. 3. Port Publishing

   3 tasks · 2 interviews· 30 min
   • Explain why container ports are isolated by default.
   • Publish container ports to specific host ports using the -p flag.
   • Verify host port mappings and access services running inside containers.

   port-publish

4. 4. Bind Mounts for Development

   3 tasks · 2 interviews· 30 min
   • Understand the difference between container layers and host storage.
   • Mount host directories into containers using bind mounts.
   • Leverage bind mounts for real-time local code hot reloading.

   bind-mounts

5. 5. Creating Custom Images

   9 tasks · 6 interviews· 1 h 10 m
   • Explain how images are built from layered instructions.
   • Write a Dockerfile using FROM, WORKDIR, COPY, RUN, and CMD.
   • Build and tag a custom Docker image using docker build.

   dockerfile-instructionsimage-buildimage-layers

6. 6. Optimizing Dockerfiles

   3 tasks · 2 interviews· 30 min
   • Explain how Docker's build cache works and how to structure layers to maximize cache hits.
   • Use .dockerignore to exclude unnecessary files from the build context.
   • Implement multi-stage builds to minimize production image size.

   dockerfile-optimization

7. 7. Data Persistence with Volumes

   3 tasks · 2 interviews· 20 min
   • Explain the difference between bind mounts and named volumes.
   • Create, inspect, and manage named Docker volumes.
   • Persist container data across container recreations using named volumes.

   data-volumes

8. 8. Container Networking

   3 tasks · 2 interviews· 25 min
   • Understand default vs user-defined bridge networks.
   • Create custom bridge networks.
   • Connect multiple containers to a network and resolve them using DNS service names.

   container-networking

9. 9. Multi-Container Orchestration with Compose

   3 tasks · 2 interviews· 30 min
   • Define a multi-container stack in a compose.yaml file.
   • Configure service dependencies, custom networks, and named volumes in Compose.
   • Manage the entire stack lifecycle using docker compose up and down.

   docker-compose